On 9 November 2016 at 07:49, Dimitris Chloupis <kilon.alios@gmail.com> wrote:
Not in C but there std::string in C++ similar to our String object.
Strictly speaking , std::string is again not part of C++ per se, it comes from library that implements such class.
C char indeed is more a byte array than a string. Actually C won't allow to change the string value mainly because it thinks you try to change the size which something that is not allowed for arrays anyway, so the only way to change a char string aka char array is character by character.
Null termination is why I filled the shared memory with zeros to be on the safe side and then added the string and the number on top
just wanted to warn you, to make sure you understand that char[100] is not string, not in C , not in C++. And, of course, it should not autoconvert to smalltalk String object(s) in FFI, because many C coders use 'char' as a default data type to operate with buffers of certain length and to count their size in bytes.
On Wed, 9 Nov 2016 at 03:41, Igor Stasenko <siguctua@gmail.com> wrote:
What i meant, i wanted to warn Dimitris that char[100] are just array of 100 characters (bytes in C).. and has nothing to do with strings. Do not confuse fixed-length C arrays with strings. There's no 'string' data type in C, and instead they use null-terminated character sequence as a convention. But it is not a fixed-size data.
On 9 November 2016 at 02:38, Igor Stasenko <siguctua@gmail.com> wrote:
On 8 November 2016 at 14:42, Esteban Lorenzano <estebanlm@gmail.com> wrote:
(always with Char100 example in mind):
s := MyStructure fromHandle: blah. string := s data readString.
should work.
IIRC, #readString works correctly only for correctly null-terminated strings. If not, it will read beyond the structure size , until it find a zero byte somewhere in memory, and thus, results may vary :)
Esteban
On 8 Nov 2016, at 14:31, Dimitris Chloupis <kilon.alios@gmail.com> wrote:
I feel like stupid but I cannot find a way to convert an Array of Characters to a String , I can do with a do: and join characters converted to strings to a single string but it feels too many steps.
Is there a simpler way ?
-- Best regards, Igor Stasenko.
-- Best regards, Igor Stasenko.
-- Best regards, Igor Stasenko.